Create Indian dish 'idli' texture and rough edges?
Simple speaking, with basic sponge textures or wall pores textures we can make idli textures.

found a "sponge texture" from google images.


then converted it to blackandwhite image using Photoshop


and used that blackandwhite image to covert it to NormalMap image Filters>3D>NormalMap(or)BumpMap.


Made a simple scene containing a plate and idli. Making chutney would take quite a time.. so just added a plate and idli. Then unwarped idli and added above textures and hence this final render fellow indian.


or for detailed texturing try what @Robin Betts said in comments section.